Performance – IT Blog

Tuning nf_conntrack

In this article I will give an example of optimizing the parameters of nf_conntrack for a high-loaded NAT server.

DiskSpd. Windows IOPS Test

DiskSpd is a utility for generating a load on a disk system and measuring its performance.

Changing InnoDB log file size in MySQL

InnoDB log file size – the size of the transaction log files that are needed to cancel transactions and restore the database in case of failure.

Online diagnostics Cisco Catalyst 6500

In this article, I will describe the Cisco Catalyst 6500 online diagnostic commands.

Configuring InnoDB Buffer Pool size in MySQL

I will give an example of resizing the InnoDB buffer pool in MySQL.
In the InnoDB buffer pool, this is the memory space in which indexes, caches, buffers, etc. are stored.

Monitoring PPS (Packets Per Second) in Zabbix

I will give an example of monitoring PPS (Packets Per Second) on network interfaces in Linux.
In order to calculate the number of transmitted packets per second on the network interface, create two simple scripts, the first to calculate the transmitted packets:

Suppression of DHCP servers (dhcdrop)

dhcdrop is a utility for suppressing unnecessary DHCP servers and stress testing.

Simple page caching

I will give an example of a simple caching of PHP pages with an interval of 600 seconds (10 minutes).

Paste at the beginning of the code:

Monitoring current RX and TX network interface buffers in Zabbix

One day after restarting the Ubuntu server, due to the long start of a large number of network interfaces, my script which increased the values of the buffers and also performed other settings was performed ahead of time, respectively, the changes did not apply and I found out about this problem only after 24 hours, so I decided monitor current RX and TX buffers.

How to change open_files_limit in MySQL

I will give an example of viewing and increasing the open_files_limit parameter in MySQL.
Will perform operations in the Ubuntu Server 16.04.